Table I.
Somatic cell concentration (SCC)a and phagocytosis profile in bovine milk
| A. SCC determined within the 3 wk immediately before the study
|
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|---|---|---|---|---|---|---|---|---|
| Measurement (thousands/mL)
|
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| Cow number | 1st | 2nd | 3rd | |||||
| 1 | 152 | 24 | 19 | |||||
| 2 | 47 | 67 | 14 | |||||
| 3 | 87 | 66 | 144 | |||||
| 4 | 283 | 838 | ND | |||||
| 5 | 346 | 639 | 2954 | |||||
| 6 | 326 | 350 | 841 | |||||
| B. Phagocytic ability and SCC | ||||||||
|---|---|---|---|---|---|---|---|---|
| Unit of analysis: pooled or nonpooled samples of mammary-quarter milkb | ||||||||
| Ratio of HP to LP cellsc |
Number (%) of viable leukocytesc |
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| Cow number, quarter | SCC | All cells | MOs | PMNs | LOs | MOs | PMNs | |
| Low SCC | ||||||||
| 1 | 1 LR, RF | 17 | 1.04 | 0.55 | 2.28 | 975 (45) | 899 (42) | 289 (13) |
| 2 | 1 LF, RR | 12 | 1.23 | 0.52 | 4.62 | 499 (53) | 316 (34) | 128 (14) |
| 3 | 2 LR, RF | 15 | 1.10 | 0.83 | 3.40 | 1243 (52) | 1021 (43) | 112 (5) |
| 4 | 2 LF, RR | 15 | 1.14 | 0.58 | 2.70 | 805 (50) | 674 (42) | 142 (9) |
| 5 | 3 LF, RR | 76 | 2.36 | 0.83 | 8.00 | 670 (65) | 308 (30) | 60 (6) |
| 6 | 3 LR, RF | 15 | 1.90 | 0.80 | 6.00 | 1114 (49) | 892 (39) | 257 (11) |
| Median | 15 | 1.18d | 0.69d | 4.01d | 890 (51) | 783 (40) | 135 (10)d | |
| High SCC | ||||||||
| 7 | 4 RF | 472 | 0.37 | 0.25 | 0.50 | 1729 (53) | 1354 (42) | 175 (5) |
| 8 | 4 LR | 2031 | 0.55 | 0.32 | 1.21 | 5153 (62) | 2830 (34) | 275 (3) |
| 9 | 5 RF | 263 | 0.45 | 0.38 | 1.00 | 5235 (65) | 2605 (32) | 222 (3) |
| 10 | 5 LF | 1434 | 0.18 | 0.06 | 0.17 | 3119 (63) | 1691 (34) | 177 (4) |
| 11 | 6 LR, RF | 504 | 0.88 | 0.40 | 2.96 | 2472 (48) | 2285 (44) | 429 (8) |
| Median | 504d | 0.45 | 0.32 | 1.00 | 3119 (62)d | 2285 (34)d | 222 (4) | |
| Unit of analysis: cowe | ||||||||
| Low SCC | ||||||||
| 1 | 14 | 1.13 | 0.53 | 3.45 | 737 (49) | 607 (38) | 208 (13) | |
| 2 | 15 | 1.12 | 0.70 | 3.05 | 1024 (51) | 847 (42) | 127 (7) | |
| 3 | 46 | 2.13 | 0.81 | 7.00 | 892 (57) | 600 (34) | 158 (8) | |
| Median | 15 | 1.13d | 0.70d | 3.45d | 892 (51) | 607 (38) | 158 (8) | |
| High SCC | ||||||||
| 4 | 1251 | 0.46 | 0.28 | 0.86 | 3441 (57) | 2092 (38) | 225 (4) | |
| 5 | 848 | 0.31 | 0.22 | 0.58 | 4177 (64) | 2148 (33) | 199 (3) | |
| 6 | 504 | 0.88 | 0.40 | 2.96 | 2472 (48) | 2285 (44) | 429 (8) | |
| Median | 848d | 0.46 | 0.28 | 0.86 | 3441 (57)d | 2148 (38)d | 225 (4) | |
ND — not done; HP — high phagocytic ability; LP — low phagocytic ability; MOs — macrophages; PMNs — polymorphonuclear cells; LOs — lymphocytes; LR — left rear; RF — right front; LF — left front; RR — right rear
a
Average from 4 (A) or 1 to 2 (B) mammary quarters
b
Composite (LR, RF) or single (RF) mammary quarters
c
Based on values for light-scatter parameters
d
Significantly higher than in the other SCC group (P < 0.05)
e
Individual cow values are the average of 2 separate measurements, each derived from pooled or nonpooled quarter samples, except for high-SCC cow 6, for which there was a single measurement from 2 quarter samples